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![[Post New]](/templates/default/images/icon_minipost_new.gif) 25 Feb 2008 08:07:03 IST
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why ortho sustited aromatic carboxylic acids are stronger thanpara substited
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25 Feb 2008 12:07:10 IST
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well it is explained by ortho effect........
any type of substituient , when attached to ortho position to -COOH , its acid strenght is greater than that of benzoic acid..........
it arises bcoz due to steric factors the coplanarity of -COOH groupt with benzene ring is lost.dat's why resonance is not possible with benzene ring and -COOH group ,as a result ......acid strenght increasese..........
u will understand better by drawing the resonance structures......
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B.Tech CSE, ISMU |
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26 Feb 2008 07:59:12 IST
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thanks for your ans. and best of luck for your board exams
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26 Feb 2008 12:27:33 IST
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thanx..........
and best of luck to you tooooooooooooooo....
cheers.
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B.Tech CSE, ISMU |
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26 Feb 2008 14:17:26 IST
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yup its due to ortho effect...but i have a doubt guys......it isnt in our ncert text...so can it come for the board exam
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27 Feb 2008 20:52:07 IST
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ya its ortho effect which comes into play!!!!!
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27 Feb 2008 21:02:15 IST
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plzz help iam a little confused ......... if effective resonance does not take place in case of ortho substituent then the resonance structure is of carboxalate ion only which anyway is also one the resonance structure whwn otho substituent is not present and why this is not valid in case if NH2 is the ortho substituent plzz help only 2 days r left
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28 Feb 2008 19:41:50 IST
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i guess ortho effect is valid for every grp..
ive been taught so..
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